Intentionality - "is at the heart of knowing. We live in meaning, and we live 'towards,' oriented to experience. Consequently there is an intentional structure in textuality and expression, in self-knowledge and in knowledge of others. This intentionality is also a distance: consciousness is not identical with its objects, but is intended consciousness" (quoted from Dr. John Lye's website - see suggested resources below).
On the Web, usability is a necessary condition for survival. If a website is difficult to use, people leave . If the homepage fails to clearly state what a company offers and what users can do on the site, people leave . If users get lost on a website, they leave . If a website's information is hard to read or doesn't answer users' key questions, they leave . Note a pattern here? There's no such thing as a user reading a website manual or otherwise spending much time trying to figure out an interface. There are plenty of other websites available; leaving is the first line of defense when users encounter a difficulty.